Improve autocomplete + error messages for comparator expressions

[ssalbdivad]

Parsing > as a finalizer interfered a bit with the error messages you get for expressions like this:

const bounded = type({
  positive: "number >=",
  foo: "Date >",
  bar: "string.email <",
});

This issue should resolve the following:

• > should not be treated as a finalizer in an expression like this
• Suggestions for comparators like >= should not include keywords since they must be followed by a literal